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Fix bug in MED mapper protection bit implementation
author Michael Pavone <pavone@retrodev.com>
date Sun, 28 Apr 2024 23:33:11 -0700
parents f500831f7fb4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2035
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1 dc.l $0, start
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2 dc.l empty_handler
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3 dc.l empty_handler
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4 ;$10
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5 dc.l empty_handler
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6 dc.l empty_handler
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7 dc.l empty_handler
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8 dc.l empty_handler
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9 ;$20
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10 dc.l empty_handler
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11 dc.l empty_handler
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12 dc.l empty_handler
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13 dc.l empty_handler
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14 ;$30
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15 dc.l empty_handler
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16 dc.l empty_handler
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17 dc.l empty_handler
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18 dc.l empty_handler
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19 ;$40
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20 dc.l empty_handler
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21 dc.l empty_handler
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22 dc.l empty_handler
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23 dc.l empty_handler
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24 ;$50
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25 dc.l empty_handler
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26 dc.l empty_handler
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27 dc.l empty_handler
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28 dc.l empty_handler
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29 ;$60
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30 dc.l empty_handler
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31 dc.l empty_handler
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32 dc.l empty_handler
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33 dc.l empty_handler
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34 ;$70
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35 dc.l empty_handler
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36 dc.l empty_handler
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37 dc.l int_6
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38 dc.l empty_handler
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39 ;$80
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40 dc.l empty_handler
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42 dc.l empty_handler
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43 dc.l empty_handler
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44 ;$90
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45 dc.l empty_handler
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46 dc.l empty_handler
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47 dc.l empty_handler
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48 dc.l empty_handler
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49 ;$A0
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50 dc.l empty_handler
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51 dc.l empty_handler
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52 dc.l empty_handler
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53 dc.l empty_handler
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54 ;$B0
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55 dc.l empty_handler
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56 dc.l empty_handler
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57 dc.l empty_handler
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58 dc.l empty_handler
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59 ;$C0
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60 dc.l empty_handler
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61 dc.l empty_handler
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62 dc.l empty_handler
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63 dc.l empty_handler
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64 ;$D0
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65 dc.l empty_handler
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66 dc.l empty_handler
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67 dc.l empty_handler
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68 dc.l empty_handler
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69 ;$E0
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70 dc.l empty_handler
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71 dc.l empty_handler
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72 dc.l empty_handler
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73 dc.l empty_handler
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74 ;$F0
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75 dc.l empty_handler
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76 dc.l empty_handler
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77 dc.l empty_handler
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78 dc.l empty_handler
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79 dc.b "SEGA IS COOL "
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80 dc.b "(C)M.Pavone 2021"
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81 dc.b "TRAIN MEMES STAN"
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82 dc.b "D SILENTLY "
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83 dc.b " "
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84 dc.b "TRIUMPHANT MAMMA"
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85 dc.b "LS SALUTE SOCIAL"
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86 dc.b "ITES "
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87 dc.b "MP 20210227-01",0,0
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88 dc.b "J "
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89 dc.l $0
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90 dc.l romend-1
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91 dc.l $FF0000
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92 dc.l $FFFFFF
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93 dc.b " "
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94 dc.b " "
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95 dc.b " "
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96 dc.b " "
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97 dc.b "JUE "
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98
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99 frame_counter equ $FFFF8000
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100 ram_code equ $FFFF8002
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101
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102 empty_handler:
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103 rte
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104 start:
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105 lea $A14000, a3
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106 move.l #'SEGA', (a3)
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107 lea $C00000, a0
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108 lea $C00004, a1
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109 move.w #$8104, (a1) ;Mode 5, everything turned off
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110 move.w #$8004, (a1)
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111 move.w #$8220, (a1) ;Scroll a table $8000
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112 move.w #$8404, (a1) ;Scroll b table $8000
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113 move.w #$8560, (a1) ;SAT table $C000
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114 move.w #$8700, (a1) ;backdrop color 0
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115 move.w #$8A01, (a1) ;Set HINT counter
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116 move.w #$8B00, (a1) ;full screen scroll
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117 move.w #$8C81, (a1) ;40 cell mode, no interlace
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118 move.w #$8D00, (a1) ;hscroll table at 0
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119 move.w #$8F02, (a1) ;autoinc 2
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120 move.w #$9011, (a1) ;64x64 scroll size
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121
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122 moveq.l #0, d0
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123 ;init palette
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124 move.l #$C0000000, (a1)
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125 move.w d0, (a0)
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126 move.w #$EEE, (a0)
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127
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128 ;clear scroll table
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129 move.l #$40000000, (a1)
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130 move.l d0, (a0)
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131
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132 ;clear vsram
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133 move.l #$40000010, (a1)
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134 move.l d0, (a0)
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135
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136 ;clear SAT
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137 move.l #$40000003, (a1)
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138 move.l d0, (a0)
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139 move.l d0, (a0)
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140
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141 ;load tiles
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142 move.l #$44000000, (a1)
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143 lea font, a2
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144 move.w #((fontend-font)/4 - 1), d0
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145 tloop:
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146 move.l (a2)+, (a0)
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147 dbra d0, tloop
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148
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149 ;clear name table
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150 move.l #$40000002, (a1)
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151 moveq #32, d0
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152 move.w #(64*64-1), d1
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153 ploop:
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154 move.w d0, (a0)
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155 dbra d1, ploop
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156 move.l #$45960002, d7
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
157 move.l d7, (a1)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 move.l #$800000, d6
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
159
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 lea ram_code_src(pc), a6
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 lea ram_code.w, a5
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162 moveq #(font-ram_code_src)/2-1, d0
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 copy:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164 move.w (a6)+, (a5)+
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165 dbra d0, copy
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166 lea $101(a3), a4
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 lea $100.w, a5
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 move.l #'SEGA', d5
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 move.l #' SEG', d4
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 moveq #0, d0
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 moveq #1, d2
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 move.w #180, d3
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173 btst #6, $A10001
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
174 beq .not_pal
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 move.w #150, d3
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 .not_pal:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 jmp ram_code.w
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
179 ram_code_src:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 move.b d2, (a4)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
181 cmp.l (a5), d5
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 beq.s is_good
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 cmp.l (a5), d4
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 bne.s is_bad
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 is_good:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 move.b d0, (a4)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 lea good(pc), a6
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 bsr.s print_string
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
189
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 add.l d6, d7
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 move.l d7, (a1)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 bsr.s print_string
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
194 add.l d6, d7
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
195 move.l d7, (a1)
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
196 bsr.s print_string
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
197
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
198 move.w #0, frame_counter.w
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 move.w #$8164, (a1)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 move #$2500, SR
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 wait:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 cmp.w frame_counter.w, d3
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 bne.s wait
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 move #$2700, SR
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205 move.b d2, (a4)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 move.l $0.w, a7
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 move.l $4.w, a6
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 move.w #$8104, (a1)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 move.l d0, (a3)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 jmp (a6)
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
211
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212 is_bad:
2038
5b51f03b2227 Don't init IO ports in TMSS ROM as it trips up the standard Sega init code
Michael Pavone <pavone@retrodev.com>
parents: 2035
diff changeset
213 move.b d0, (a4)
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 lea bad(pc), a6
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 bsr.s print_string
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
216
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 add.l d6, d7
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
218 move.l d7, (a1)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219 bsr.s print_string
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
220
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 add.l d6, d7
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222 move.l d7, (a1)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 bsr.s print_string
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
224
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
225 move.w #$8144, (a1)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
226 forever:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 bra.s forever
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
228
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
229
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
230 int_6:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 addq.w #1, frame_counter.w
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 rte
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
233
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234 ;Prints a null terminated string
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
235 ;a6 - pointer to string
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
236 ;a0 - VDP data port
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
237 ;d0 - base tile attribute
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
238 ;
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
239 ;Clobbers: d1.w
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
240 print_string:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
241 .loop
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
242 moveq #0, d1
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
243 move.b (a6)+, d1
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
244 beq .end
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
245 add.w d0, d1
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
246 move.w d1, (a0)
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
247 bra .loop
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
248 .end
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
249 rts
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
250
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
251 good:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
252 dc.b " BLASTEM THINKS", 0
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
253 dc.b " THAT THIS CART", 0
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
254 dc.b " TASTES DELICIOUS!", 0
2331
f500831f7fb4 Fix missing init in fake TMSS
Michael Pavone <pavone@retrodev.com>
parents: 2038
diff changeset
255
2035
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
256 bad:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
257 dc.b " *sniff* *sniff*", 0
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
258 dc.b " something doesn't", 0
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
259 dc.b " smell right...", 0
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
260
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
261 align 1
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
262 font:
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
263 incbin font.tiles
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
264 fontend
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
265
33f454232aee Added open source TMSS replacement
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
266 romend